Rather than being ashamed of storage spaces, show them off. But show them off correctly. This is a large part of decluttering. The more organized your drawers, closets and garage are the more a buyer will see that space as usable. If storage spaces are cluttered or overpacked, they will doubt if their things will fit into your house. Show potential buyers how to organize their things to fit into your house. Even the most disorganized buyer will see themselves as being more organized if you set good expectations.